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Model Forum / Radio Controlled / Air Models / March 2009



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WTB: Full-size plans for Dave Robelin's Square Shooter

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hershey - 13 Mar 2009 07:06 GMT
Hi-
I started one of these when I was 16, some 40 years ago. It was
featured in MAN in April, 1969.   I never finished it, and of course,
have long since lost the plans.
If I could purchase a copy, I would be most grateful.

Thanks,
Lew
WB4GUK@aol.com - 14 Mar 2009 14:27 GMT
> Hi-
> I started one of these when I was 16, some 40 years ago. It was
[quoted text clipped - 4 lines]
> Thanks,
> Lew

AMA list the plan as availble for $15.

Dan
hershey - 14 Mar 2009 19:12 GMT
On Mar 14, 6:27 am, WB4...@aol.com wrote:

> > Hi-
> > I started one of these when I was 16, some 40 years ago. It was
[quoted text clipped - 8 lines]
>
> Dan

Thanks!!!
Vance Howard - 14 Mar 2009 20:27 GMT
> On Mar 14, 6:27 am, WB4...@aol.com wrote:
> >
[quoted text clipped - 12 lines]
>
> Thanks!!!

Also, If you started this 40 years ago and have balsa from that time.
it has probably dried out and become brittle. Better off to start over
with fresh balsa and other building supplies.

Signature

To reply by email, use:
vhoward1122atgmaildotcom

hershey - 14 Mar 2009 21:47 GMT
> > On Mar 14, 6:27 am, WB4...@aol.com wrote:
>
[quoted text clipped - 20 lines]
> To reply by email, use:
> vhoward1122atgmaildotcom

That's good advice.
Plus, the plane has long-since disappeared, in the many moves I've
made since '69.
Ken Cashion - 15 Mar 2009 12:20 GMT
>> On Mar 14, 6:27 am, WB4...@aol.com wrote:
>> >
[quoted text clipped - 16 lines]
>it has probably dried out and become brittle. Better off to start over
>with fresh balsa and other building supplies.

Taking a different approach and being obtuse...how can balsa dry out?
I thought balsa was already dried out when I got it and that is what
made it light.

What is in the wood to dry out?

Can I squeeze a new piece of balsa and make something ooze out?

These are serious questions.  What are the answers?

Ken
Morgans - 15 Mar 2009 13:22 GMT
> Taking a different approach and being obtuse...how can balsa dry out?
> I thought balsa was already dried out when I got it and that is what
[quoted text clipped - 5 lines]
>
> These are serious questions.  What are the answers?

All wood has a moisture content.  The moisture in the air keeps a small
percentage of moisture in the grain, in the form of just plain water, and in
the form of sap, or natural resins.  Balsa wood in the summer will have more
moisture than in the winter, if it is kept in a heated environment.

I do somewhat question how much more that balsa would dry out.  I am sure
that I have wood that is close to 18 years old, and I think it is still
useable.  It is in a basement, so that would tend to keep it more damp.

I think you would need to do a little testing on wood to see if it is still
strong after many years.  Then use it if it is still good.
Signature

Jim in NC

Ken Cashion - 17 Mar 2009 14:37 GMT
>> Taking a different approach and being obtuse...how can balsa dry out?
>> I thought balsa was already dried out when I got it and that is what
[quoted text clipped - 9 lines]
>percentage of moisture in the grain, in the form of just plain water, and in
>the form of sap, or natural resins.

This, I think, is the issue...natural resins.  Moisture can be put
back in wood, the natural resins cannot  (I think).  I believe the
natural resins are what permits the wood to flex but not break.

>Balsa wood in the summer will have more
>moisture than in the winter, if it is kept in a heated environment.
   
    I have had mold in the shop...moisture is there.  <g> It is
within 30' of the edge of a south Mississippi swamp and was not always
air-conditioned or heated.

>I do somewhat question how much more that balsa would dry out.  I am sure
>that I have wood that is close to 18 years old, and I think it is still
>useable.

You think?  Go grab some of it and bend it and treat it like you used
to and see if the sheets split and the sticks become three or four
shorter ones when waved figorusly around the room.

> It is in a basement, so that would tend to keep it more damp.

Basements down here would be an indoor pool.

>I think you would need to do a little testing on wood to see if it is still
>strong after many years.  Then use it if it is still good.

I have arranged a little test.  I really hate the idea of throwing out
over $700 in balsa.

Ken
MJKolodziej - 17 Mar 2009 15:22 GMT
>>> Taking a different approach and being obtuse...how can balsa dry out?
>>> I thought balsa was already dried out when I got it and that is what
[quoted text clipped - 42 lines]
>
> Ken

I have replaced old balsa.  It was brittle. It may have been brittle 20
years ago but it wasn't going into a plane I was building.
mk
Ken Cashion - 17 Mar 2009 20:53 GMT
>>>> Taking a different approach and being obtuse...how can balsa dry out?
>>>> I thought balsa was already dried out when I got it and that is what
[quoted text clipped - 46 lines]
>years ago but it wasn't going into a plane I was building.
>mk

I know I can use it for other stuff (?) but most of the time we want
the lightness and strength...I guess if I was into HO trains, there
would be other things I could do with it.

Ken
 
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